Why is there no love for Prima Luna?

Because people here are biased against Chinese made products. What they don’t know is how great PL products are. I owned a pair of their 70 watt monoblocks, and drove Martin Logan  CLSiiz’s with them for some of the best sound in my room. There was headroom aplenty. These were 85db speakers which commonly dropped to a 1 ohm load. Zero issues with the amps driving the speakers. People are simply biased, and some are simply audio snobs, which are very very common among the audio community. PL rules. They’ve been around nearly 15 years. What else do you want? To heck with the snobs. 

I've heard the big PL amps with KT150s driving $60,000 Sonus Fabers and the sound was very good.  Not for detail enthusiasts but lovely sound.  I do not like Mac 275s.  I've heard 4 or 5 of iterations over the years.  Leaves me unsatisfied with a variety of speakers.   I would rather have new Mac SS than the 275.  PLs are very reputable and I know the authorized repairman who said he saw a substantial number (dozens) for repair a few years back but that is only because Kevin Deal sells a boatload of them.  They are very reliable and the latest EVO 400 has premium parts and construction at the price.   Ayon equipment sounds more refined than PL but generally costs much more.  I would rather have Ayon or VAC gear.  I don't have Chinese gear because my gear is from U.S., U.K., Swiss, German, Taiwan and Japan.  No specific reason why it's not from China.  Don't knock PL gear just because it is made in China, it's a U.S. brand and has very good U.S. support.

How about an $100 Yugo? Would that be "great buy at this price point"?

Yes. I paid $402 although that one had aero kit and a few more extras.

You’re  in luck OP.  Hot off the press.  Good luck. 
https://parttimeaudiophile.com/2020/12/05/the-best-integrated-amplifiers-buyers-guide-2021/

They are a relatively inexpensive China made, mass produced product that sound decent enough and are pretty well put together. Kevin is smart, he has a lot of say into what they are, how they are and what they need to be in so far are as how he sees the needs and wants of the NA market from this semi-upscale-midfi gear. 
They charge a fair price for a pretty good product. Good value proposition for the value buyer that needs a good enough sound. That are happy with the PL sound. It’s a decent enough sound so sure enough many will enjoy it. 
That alone will cover enough people to fuel this little upscale audio cottage industry and fair enough. Not a thing wrong with it. Moreover, he really has done a nice job cultivating this niche in the market. He has expanded the demand by evolving the product offerings and their performance envelope while combining sound marketing with good service and simple to use and safe design. 

Solid stuff business wise. 

The thing is with this hobby there just happen to be people looking for more than that. Some a lot more and others are not. 

Myself, in that price bracket I’d rather buy... hmmm let’s see... VAC, ARC, MAC, CJ, VTL, LAMM, Manley just to name a couple tube brands that are MUCH better in every aspect but that just MO. Yes even used some of these may be more money but just saying. I’ll take a slightly used, late model Honda over a new Kia (one Japanese and one South Korean) any day of the week and twice on Sunday but that’s me. To each their own...